pjsip_session.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2017, CFWare, LLC
 *
 * Corey Farrell <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

#include "asterisk.h"

#include <pjsip.h>
#include <pjsip_ua.h>
#include <pjlib.h>

#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
#include "include/res_pjsip_private.h"
#include "asterisk/linkedlists.h"
#include "asterisk/lock.h"
#include "asterisk/module.h"


AST_RWLIST_HEAD_STATIC(session_supplements, ast_sip_session_supplement);

void ast_sip_session_register_supplement_with_module(struct ast_module *module, struct ast_sip_session_supplement *supplement)
{
 struct ast_sip_session_supplement *iter;
 int inserted = 0;
 SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);

 ast_assert(supplement != NULL);

 supplement->module = module;

 if (!supplement->response_priority) {
 supplement->response_priority = AST_SIP_SESSION_BEFORE_MEDIA;
 }

 AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
 if (iter->priority > supplement->priority) {
 AST_RWLIST_INSERT_BEFORE_CURRENT(supplement, next);
 inserted = 1;
 break;
 }
 }
 AST_RWLIST_TRAVERSE_SAFE_END;

 if (!inserted) {
 AST_RWLIST_INSERT_TAIL(&session_supplements, supplement, next);
 }
}

void ast_sip_session_unregister_supplement(struct ast_sip_session_supplement *supplement)
{
 struct ast_sip_session_supplement *iter;
 SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);

 AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
 if (supplement == iter) {
 AST_RWLIST_REMOVE_CURRENT(next);
 break;
 }
 }
 AST_RWLIST_TRAVERSE_SAFE_END;
}

static struct ast_sip_session_supplement *supplement_dup(const struct ast_sip_session_supplement *src)
{
 struct ast_sip_session_supplement *dst = ast_calloc(1, sizeof(*dst));

 if (!dst) {
 return NULL;
 }
 /* Will need to revisit if shallow copy becomes an issue */
 *dst = *src;

 return dst;
}

int ast_sip_session_add_supplements(struct ast_sip_session *session)
{
 struct ast_sip_session_supplement *iter;
 SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);

 AST_RWLIST_TRAVERSE(&session_supplements, iter, next) {
 struct ast_sip_session_supplement *copy = supplement_dup(iter);

 if (!copy) {
 return -1;
 }

 /* referenced session created. increasing module reference. */
 ast_module_ref(copy->module);

 AST_LIST_INSERT_TAIL(&session->supplements, copy, next);
 }

 return 0;
}

void ast_sip_session_remove_supplements(struct ast_sip_session *session)
{
 struct ast_sip_session_supplement *iter;

 if (!session) {
 return;
 }

 /* free the supplements */
 while ((iter = AST_LIST_REMOVE_HEAD(&session->supplements, next))) {
 if (iter->module) {
 /* referenced session closed. decreasing modue reference. */
 ast_module_unref(iter->module);
 }

 ast_free(iter);
 }

 return;
}